MEDICAL ENCYCLOPEDIA. 1  Back pain - returning to work. 2  Back pain and sports. 3  Compression fractures of the back. 4  Lifting and bending the right way. 5  Lumbosacral spine x-ray. 6  Returning to sports after a back injury. 7  Spinal fusion. 8  Spinal fusion - slideshow. 9  Vertebroplasty - slideshow.
The mucociliary escalator is one of the major defense mechanisms, which protect the lung, and if the mucociliary escalator fails, it increases the risk that the normal and potentially pathogenic, inhabitants of the nose, throat and the back of the mouth, will descend into the lung, resulting in a potentially life-threatening pneumonia ( Anatomy and Physiology, 2013, p. 139).
The primary and secondary cell walls serve as the outer covering of the plasma membrane, while the middle lamella acts as the intermediate partition between two adjacent plant cells. Describe the role of the plasmodesmata in plant cell communication. Plasmodesmata form cytoplasmic channels, lined by membranes, that allow the cytoplasm of one plant cell to run continuously into an adjacent cell. Plasmodesmata unify an entire plant, generating linkages among all the cells. Cytoskeletal structures at the sites of the plas-modesmata guide large molecules towards the channels, facilitating their entry into adjacent cells. TEST YOUR KNOWLEDGE Question 1 Which of the following does NOT enclose a plant cell? collagen a. cellulose b. middle lamella c. primary cell wall d. secondary cell wall e.